Make histogram from data table in R [duplicate]

问题

This question already has answers here:

How to make a barplot with R from a table? (2 answers)

Closed 3 years ago.

I have a variable say a which has data as

Count |  Value
2 | Apple
5 | Ball
6 | Cat
10 | Dog

I want to construct a histogram such that, I have the values in x-axis and count in y axis. Dont know how to do

回答1:

We can use barplot

barplot(setNames(df1$Count, df1$Value))

data

df1 <- structure(list(Count = c(2, 5, 6, 10), Value = c("Apple", "Ball",  
"Cat", "Dog")), .Names = c("Count", "Value"), class = "data.frame",
 row.names = c(NA, -4L))

来源：https://stackoverflow.com/questions/36759077/make-histogram-from-data-table-in-r